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Geology/please identify


Found these in shallow water along the shoreline in ontario, canada. Many different heavy glasslike pieces of colours black, gray, blues, greens and purple. Some pieces with two different shades of one colour. There are also lightweight sponge type rock. One piece of blue glitters of a rainbow somewhat like gas on water colour.
Thank you for your time,

To me, from the pics, the samples appear to be varieties of silica like chert-jasper-chalcedony etc.
Nowadays a lot of artificial/synthetic materials have come in the markets for a variety of use. Therefore i must caution and confess that identification of such samples be done on spot by at least by  visual examination if not by laboratory tests.


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Worked in the Geological Survey of India for aabout 32 years. Presently - GeoConsultant & Advisor - HIGEOS India

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